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2012 Forester X Auto
3,215 Posts
Since the noise is independent of engine rpms, it is very likely a wheel/running gear issue., as you surmised.
You may notice it more when coasting due to less engine noise, so that may be a red herring.
Bearings can squeal as well as howl, but I'm thinking you might have a rock stuck in the brake caliper guard.
That can make an incredibly loud sound and the symptoms sound very similar to the situation I had, which was the cause in my case.
If you can isolate where the car is making the noise (get someone to help drive/listen) and lift that wheel, try rotating it to see if you can get any sound out of it.
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